Speedometer off with new gear
Thread Starter
Senior Member
Joined: Jan 2002
Posts: 506
Likes: 1
From: Miami, FL
Car: 1992 Formula
Engine: 350
Transmission: auto stock
Axle/Gears: 3:42
Speedometer off with new gear
Hello, I had my gear switched to a 3:42 and now my speedometer is off, it show's I am going way too fast. How do I get it corrected with new gear to read right? Thanks! Andy
Last edited by 1991Formula350; Sep 11, 2007 at 02:58 PM. Reason: spelling
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Speedometer off with new gear
You need to change the speedometer gears in the transmission to match the new gearing in the rear.
Thread Starter
Senior Member
Joined: Jan 2002
Posts: 506
Likes: 1
From: Miami, FL
Car: 1992 Formula
Engine: 350
Transmission: auto stock
Axle/Gears: 3:42
Re: Speedometer off with new gear
Do I have to take it back to have it done or is it simple to do? Thanks! Andy
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Speedometer off with new gear
On a 700R4 it's relatively simple to do. Check the tech articles for directions.
Thread Starter
Senior Member
Joined: Jan 2002
Posts: 506
Likes: 1
From: Miami, FL
Car: 1992 Formula
Engine: 350
Transmission: auto stock
Axle/Gears: 3:42
Re: Speedometer off with new gear
Finally was able to get up to speed with new gear today, rear tires sound like they were at limit, loud spinning sound, I have to take car back to shop this weekend again to re check, something is not right. Andy
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